Using Rex To Automate Your Datacentre

In my day to day work I come across a lot of tasks that I actually
"hate" to be honest. Most of these tasks consist of things that are
repetitive and take up a lot of time. A co-worker of mine once told me,
"if you have to do a task more than once, automate it!". This is one
piece of advice that intrigued me. Ever since that day I have been
thinking about automation and how to make processes flow smoother than
they did before. But the main question always is, what tool are you
going to use for that?